Manitowoc Q270 series User Manual

Technician’s
Handbook
This manual is updated as new information and models are
released. Visit our website for the latest manual.
www.manitowocice.com
America’s #1 Selling Ice Machine
Manitowoc
QM20/QM30/QM45
SM50
Q130/Q170/Q210/Q270
Undercounter
Ice Machines
Part Number 80-01111-9 7/10

Manitowoc Q270 series Specifications

General

Power Cord Length	6 ft (1.8 m)
Type	Ice Maker
Power Supply	115V/60Hz/1Ph
Condenser Type	Air-cooled
Refrigerant	R404A
Amperage	10.5A

Summary

Safety and Operational Notices

Safety Notices Explained

Explains the meaning of Warning and Caution safety indicators.

Procedural Notices Explained

Explains the meaning of Important and Note procedural indicators.

General Information

Model Numbers Covered

Lists the ice machine models covered by the manual.

Model and Serial Number Location

Ice Machine Warranty Information

Owner Warranty Registration Card

Instructions for completing and mailing the warranty registration card.

Commercial Warranty Coverage

Outlines parts and labor coverage for commercial ice machines.

Residential Warranty Coverage

Installation Requirements

Location of Ice Machine

Specifies criteria for selecting an appropriate installation location.

Clearance and Heat Rejection Data

Provides clearances and lists heat rejection data for different models.

Leveling the Ice Machine

Leveling Procedures by Model

Step-by-step guides for leveling different ice machine models.

Electrical Requirements and Specifications

Voltage, Fuse, and Circuit Breaker

Details electrical specifications, protection, and voltage requirements.

Electrical Specifications Table

Presents electrical data like voltage, breaker size, and amps by model.

Water Service and Drains

Water Supply, Inlet Lines, and Drain Connections

Guidelines for water supply, inlet line installation, and drain connections.

Cooling Tower Applications

Water Supply and Drain Line Sizing

Sizing for QM45/Q130/Q170/Q210/Q270

Specifies tubing size, fittings, pressure, and temperature for connections.

Sizing for QM20/QM30

Details tubing size, fittings, pressure, and temperature for connections.

Sizing for SM50

Specifies tubing size, fittings, pressure, and temperature for connections.

Component Identification

QM45/Q130/Q170/Q210/Q270 Components

Identifies key components in the evaporator compartment.

QM45/Q130/Q170/Q210 External Components

Identifies external components on these models.

Q270 External Components

Identifies external components on the Q270 model.

QM20/QM30 Components Identification

Identifies key internal components of QM20/QM30.

QM20/QM30 External Components

Identifies external components on the QM20/QM30 models.

SM50 Components Identification

Identifies main internal and external components of the SM50.

Maintenance Procedures

Ice Machine Inspection and Exterior Cleaning

Checks for leaks and proper tubing placement; instructions for exterior cleaning.

Condenser Cleaning Procedures

Procedures for cleaning air-cooled and water-cooled condensers.

Interior Cleaning and Sanitizing

Cleaning and Sanitizing Steps

Detailed steps for cleaning and sanitizing internal components.

Component Removal for Cleaning

Instructions on removing components like water pump and probe.

Removal from Service/Winterization

Self-Contained and Water-Cooled Procedures

Procedures for preparing units for service removal or winterization.

Ice Machine Operation

QM45-Q270 Operation Sequences

Details start-up, freeze, harvest, and shut-off sequences.

Energized Parts Chart for QM45-Q270

Lists components energized during operational stages for QM45-Q270.

QM20/QM30 Operation Sequences

Explains the operational sequences for QM20/QM30 models.

SM50 Operation Sequences

Describes the operational cycles for the SM50 model.

Operational Checks

Siphon System and Water Level Verification

Verifies siphon system function and correct water level.

Water Level Check and Adjustment

Steps for checking and adjusting the float valve for proper water level.

Ice Thickness Check and Adjustment

Checks and adjusts the ice thickness probe for optimal ice bridge.

Troubleshooting Guide

Diagnosing Ice Machine Not Running

Step-by-step guide to troubleshoot machines that won't start.

Diagnosing Ice Thickness Control Circuitry

Procedures to diagnose issues with the ice thickness sensing circuit.

Ice Production Check

Method to check and verify ice production rates.

Installation and Visual Inspection Checklist

Checklist for initial installation and visual checks.

Water System Checklist

Identifies common water-related problems and solutions.

Ice Formation Pattern Analysis

Analyzes evaporator ice formation for diagnostic clues.

Safety Limit Feature Explanation

Explains built-in safety limits that stop the machine.

Safety Limit Checklist

Checklists to help technicians diagnose safety limit triggers.

Analyzing Discharge Pressure

Procedure to analyze discharge pressure readings for diagnosis.

Analyzing Suction Pressure

Procedure to analyze suction pressure readings for diagnosis.

Hot Gas Valve Analysis

Troubleshooting guide for the hot gas valve.

Refrigeration Component Diagnostic Chart

A chart for diagnosing refrigeration problems based on symptoms.

QM20/QM30 Diagnosing Machine Not Running

Troubleshooting guide for QM20/QM30 models that will not run.

QM20 Refrigeration Diagnostics

Diagnostic information specific to QM20 refrigeration system issues.

QM45 Electrical and Refrigeration Diagnostics

Notes on QM45 electrical troubleshooting and refrigeration diagnostics.

SM50 Diagnosing Machine Not Running

Troubleshooting guide for SM50 models that will not run.

Ice Machine Will Not Harvest

Troubleshooting steps when the ice machine fails to harvest ice.

Ice Quality Issues

Addresses problems like shallow, incomplete, or white ice cubes.

Freeze Cycle Long/Low Ice Production

Troubleshooting steps for slow ice production or long freeze cycles.

Machine Runs with No Ice Produced

Troubleshooting steps when the machine runs but produces no ice.

Component Check Procedures

Main Fuse Check

Function, specifications, and check procedure for the main fuse.

Bin Switch Check and Removal

Function, check procedure, and removal for the bin switch.

Bin Thermostat Check

Function, specifications, and check procedure for the bin thermostat.

SM50 Bin Thermostat Adjustment

Function, specifications, and adjustment for the SM50 bin thermostat.

Liquid Line Thermistor Check

Function, specifications, and check procedure for the thermistor.

Diagnosing Start Components

Guidance for diagnosing capacitor and relay issues.

ON/OFF/WASH Toggle Switch Check

Function, specifications, and check procedure for the toggle switch.

Ice Thickness Probe Functionality

Explains how the probe works and the freeze time lock-in.

Ice Thickness Check and Adjustment

Checks and adjusts the ice thickness probe for optimal ice bridge.

Compressor Electrical Diagnostics

Checks resistance values and motor windings for compressor issues.

Fan Cycle Control Check

Specifications and check procedure for the fan cycle control.

High Pressure Cutout (HPCO) Control Check

Function, specifications, and check procedure for the HPCO control.

Filter-Driers

Refrigerant Recovery and Evacuation

Definitions and Specifications

Defines terms and refers to ARI Standard 700 for refrigerant specs.

Refrigerant Re-use Policy

Manitowoc's policy on using reclaimed or recycled refrigerant.

Recovery and Recharging Procedures

Steps for recovering and recharging refrigerant for specific models.

Self-Contained Recovery/Evacuation and Charging

Procedures for refrigerant handling, evacuation, and charging.

System Contamination Cleanup

Determining Severity of Contamination

Identifies methods to determine if the system is contaminated.

Contamination/Cleanup Chart

A chart correlating symptoms to the required cleanup procedure.

Mild System Contamination Cleanup Procedure

Steps to clean systems with mild contamination.

Severe System Contamination Cleanup Procedure

Steps to clean systems with severe contamination.

Replacing Pressure Controls Without Removing Refrigerant

Performance Charts

Chart Overview

Guidelines for verifying correct ice machine operation using various charts.

QM20 Air-Cooled Charts

Cycle times and ice production data for QM20 air-cooled.

QM30 Air-Cooled Charts

Cycle times and ice production data for QM30 air-cooled.

QM45 Air-Cooled Charts

Cycle times and ice production data for QM45 air-cooled.

QM45 Operating Temperatures

Tables showing operating temperatures for QM45 models.

SM50 Air-Cooled Charts

Cycle times, ice production, and operating pressures for SM50.

Q130 Air-Cooled Charts (Before SN 310047287)

Data for Q130 air-cooled models before serial number 310047287.

Q130 Air-Cooled Charts (After SN 310047287)

Data for Q130 air-cooled models after serial number 310047287.

Q130 Water-Cooled Charts

Data for Q130 water-cooled models.

Q170 Air-Cooled Charts

Data for Q170 air-cooled models.

Q210 Air-Cooled Charts

Data for Q210 air-cooled models.

Q210 Water-Cooled Charts

Data for Q210 water-cooled models.

Q270 Air-Cooled Charts

Data for Q270 air-cooled models.

Q270 Water-Cooled Charts

Data for Q270 water-cooled models.

Diagrams

Wiring Diagrams Overview

Contains electrical wiring diagrams for various models.

Wiring Diagram Legend

Explains symbols used in wiring diagrams.

QM20 Wiring Diagram

Electrical wiring diagram for the QM20 model.

QM30 Wiring Diagram

Electrical wiring diagram for the QM30 model.

QM45 Wiring Diagram

Electrical wiring diagram for the QM45 model.

SM50 Wiring Diagram

Electrical wiring diagram for the SM50 model.

Q130/Q210 Wiring Diagram

Electrical wiring diagram for Q130/Q210 models.

Q270 Wiring Diagram

Electrical wiring diagram for the Q270 model.

Electronic Control Boards

QM20/QM30 Control Board Layout

Diagram showing the layout of the QM20/QM30 control board.

QM45-Q270 Control Board Layouts

Diagrams showing the layout of control boards for QM45-Q270 models.

SM50 Control Board Layout

Diagram showing the layout of the SM50 control board.

Tubing Schematics

QM20/QM30 Tubing Schematic

Diagram illustrating the refrigerant tubing for QM20/QM30.

QM45/Q130 Tubing Schematic

Diagram illustrating the refrigerant tubing for QM45/Q130.

SM50 Tubing Schematic

Diagram illustrating the refrigerant tubing for SM50.

Q170/Q210/Q270 Tubing Schematic

Diagram illustrating the refrigerant tubing for Q170/Q210/Q270.